They say another Herzog employee  26-year-old Matthew Thompson of Salem, Missouri  was airlifted to a Nevada hospital with serious injuries and is listed in stable condition.

Authorities say all occupants of the BNSF train were accounted for and no other injuries were reported.

BNSF spokeswoman Lena Kent says the National Transportation Safety Board will investigate the cause of the crash, which left the BNSF freight train with significant front-end damage and derailed several cars on the Herzog train.

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12:45 p.m.

A fatal collision between two BNSF Railway trains on the freight railroad’s tracks in northwestern Arizona forced Amtrak to use charter buses to carry train passengers between Flagstaff and Los Angeles.

The Mohave County Sheriff’s Office said one person was killed and another injured in the wreck, which occurred Tuesday near Truxton, Arizona, which is 103 miles (166 kilometers) west of Flagstaff.

No identities were released, and BNSF spokeswoman Lena Kent declined to say whether the people killed or injured in the wreck in rural Mohave County were BNSF employees.

Amtrak spokesman Marc Magliari said Wednesday the busing of passengers on the passenger railroad’s Southwest Chief route between Chicago and Los Angeles will continue until BNSF reopens its tracks at the wreck site.

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9:20 a.m.

BNSF Railway says its southern mainline between Southern California and Chicago remained shut down Wednesday in northwestern Arizona because of a two-train collision in which one person was killed and another injured.

No identities were released and BNSF spokeswoman Lena Kent declined to say whether the people killed or injured in the wreck near Tuesday in rural Mohave County were employees.

She also declined to provide any information about the circumstances of the wreck but said one locomotive was left derailed but upright and that two cars also were derailed.

Kent said the National Transportation Safety Board will investigate the incident. An NTSB spokesman did not immediately respond to requests for information.

The wreck occurred near Truxton, which is 103 miles (166 kilometers) west of Flagstaff.

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7:10 a.m.

Authorities say one person was killed and a second injured when two freight trains collided on BNSF Railway tracks in northwestern Arizona.

A BNSF spokeswoman did not immediately respond to requests for information but the Mohave County Sheriff’s Office says the collision occurred Tuesday near the small community of Truxton and that deputies reported that one train derailed and that the other had “significant damage.”

The Sheriff’s Office said the National Transportation Safety Board was notified of the wreck and is “involved in the investigations.”

An NTSB spokesman did not immediately respond to a request for information, and sheriff’s spokeswoman Anita Mortensen said no information is available about the people who were killed or injured and circumstances of the wreck.